Mitsubishi Electric MELSEC QS Series User Manual page 144

9
TROUBLESHOOTING
9
9.2 Check with LEDs (1) - at System Start-up
- 14
9.2.2 When "ERR." LED on the safety master module turns ON or flashes with "RUN" LED on the safety
4
Is the transmission speed setting
correctly made?
3
Yes
Are terminating resistors connected
at both ends?
Yes
Do the terminating resistors
used conform to the CC-Link dedicated
cable specifications?
Yes
Are the CC-Link
dedicated cables properly connected?
(Is it confirmed that none of the following is found?:
wire break, short-circuit, incorrect wiring, faulty connection,
nonconformance with the
cable
specifications)
Yes
Is there noise generated on the CC-
Link dedicated cable?
Yes
A hardware fault of the remote module may
be probable.
Replace the remote module .
No
Correct the transmission speed
setting.
No
Connect terminating resistors at
both ends.
No
Use terminating resistors compliant
with the CC-Link dedicated cable
specifications.
No
CC-Link dedicated
Connect the CC-Link dedicated
cables properly.
No
Check the following and take a
measure accordingly.
Are the transmission cable and the
power cable placed close to each
other ?
Is FG separated from the power
system grounding ?
Reduce the transmission speed and
check how often the error occurs.